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Finding the Fourth Proportional to 221,091.20, 331,661.10 and 80,880.20

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Solution

The fourth proportional to 221,091.20, 331,661.10 and 80,880.20 is: 121,329.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,091.20 : 331,661.10 = 80,880.20 : x
  2. Step 2: Convert to fraction form
    221,091.20/331,661.10 = 80,880.20/x
  3. Step 3: Cross multiply
    221,091.20x = 331,661.10 × 80,880.20
  4. Step 4: Simplify right side
    221,091.20x = 26,824,816,100.22
  5. Step 5: Solve for x
    x = 26,824,816,100.22/221,091.20
  6. Step 6: Final answer
    x = 121,329.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.